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ISSN Online: 2379-1748

8th Thermal and Fluids Engineering Conference (TFEC)
March, 26-29, 2023, College Park, MD, USA


Get access (open in a dialog) pages 505-515
DOI: 10.1615/TFEC2023.cmd.045140


This paper examines the bifurcation of a shock wave inside a closed-end tube. Unlike traditional shock tubes with driver and driven sections, the present model generates the shock wave in a circular closed-end tube by applying high pressure to the inlet port. In this approach, the dominant wave is a shock wave with little or no evidence of expansion waves. This form of wave generation is in contrast to the traditional shock tubes, where an expansion and a shock wave are simultaneously present. The current method generates much stronger waves. The wave becomes much more intense when it reflects at the tube end. This work studies the interaction of the reflected wave and the boundary layer. Although the method applies to any gas, this study uses argon. Two significant variables of this investigation are the gas inlet pressure and temperature. The inlet pressure determines the strength of the shock wave. Another parameter that affects the state of the contact surface and eventual impact on the wave bifurcation is temperature. The inlet temperature vary from 288 K to 1100 K. The inlet gas pressure is 300 kPa for all the computational runs. The paper discusses the method of shock wave generation inside a circular tube and its interaction with the boundary layer and wave bifurcation. Grid refinement studies verify that the computational results are grid-independent. Comparison with simple analytical predictions validates the results. Contour plots of pressure, temperature, density, and pressure gradient show the temporal development of the shock wave and its interaction with the boundary layer and eventual bifurcation.